Apparatus (moisture measuring system)

The method and frequency of calibration of the moisture measuring system?

A.01

For the measuring system, “calibration” is not necessary, but it is recommended to confirm the accuracy by measuring the standard sample.
In a volumetric titration method, it is important to determine the titer of titrant exactly. It is appropriate to calibrate the system at the time of changing the titrant and once about 2 weeks, but it is more reliable to confirm the accuracy before determination of the sample every day. In a coulometric titration method, the accuracy shall be confirmed by measuring the standard samples or water. In the presence of any abnormality, maintenance shall be conducted by cleaning the electrodes, or changing the reagent to obtain normal values.

The detecting electrode shall be cleaned by wiping gently with a paper wiper. An extreme change in the distance between platinum electrodes or the way of polishing to scratch the electrode shall be avoided. If the cathode chamber (electrolysis cell) for coulometric titration method is contaminated, it shall be washed with solvents such as alcohols. If it is severely contaminated, it shall be washed gently with a toothbrush immersed in neutral detergent, rinsed gently with water and dried sufficiently. Attention shall be paid not to break the platinum wire.

Is there any difference between the temperature set for water vaporizer and the actual temperature?

A.03

The set temperature is accurate at the position of thermoelectric couple. Since this is not a thermal analyzer, however, it shall be understood that the set temperature is not strictly consistent with the sample temperature.

To shorten an analysis time and/or gain more accurate results by cleaning an electrode tip when dehydration is not completed although Iodine exists sufficiently in excess or dehydration requires a longer time. Find this file.

Trouble shooting when solvent becomes brown before end-point or dark brown at end-point in volumetric titration.

A.07

To shorten an analytical time and/or gain more accurate results by cleaning an electrode tip, when dehydration is not completed although Iodine exists sufficiently in excess or dehydration requires a longer time. Find this file.